File match regex benchmark for RET

gistfile1.php

<?php
/**
 * Results:
 *
 * PHP 5.4: http://codepad.viper-7.com/vcV3z4
 * PHP 5.3: http://codepad.viper-7.com/4FTY5n
 * PHP 5.2: http://codepad.viper-7.com/O2cBmn
 *
 * Recommendation:
 *
 * Use Test #2. It's multi-OS compatible, it performs exact matches for
 * extensions instead of lazy matches (like Test #3), and the offest between
 * Test #2 vs Test #3 is minimal
 */

echo 'Regex benchmark for RET.', '<br><br>', 'Using 10,000 iterations to benchmark','<br><br>';

$test = array(
    '/path/to/greedy.php',
    '/path/to/home/.htaccess',
    '/path/to/.htpasswd',
    '/path/to/meta/.meta',
    '/path/to/pizza/pizza.html',
    '/path/to/food.jpg',
    '/path/to/php/match.php',
    '/path/to/github.php5',
    '/path/to/ingredients/dough.htm'
);

/**
 * Test #1 - Path with negative lookbehind/s
 *
 * @return
 *   filename
 */
$start = microtime(true);

for ($i=0; $i < 10000; $i++) {
    foreach($test as $val) {
        preg_match('#(?:.(?<!/))+(?<!\.htaccess|\.htpasswd|\.php|\.meta)$#i', $val, $matches);
        if (!empty($matches)) {
            //echo $matches[0], '<br>';
        }
    }
}

$end = microtime(true);
$time = $end - $start;

echo 'Test #1 - executed in: ', ($end - $start), ' seconds', '<br>';

/**
 * Test #2 - Negative lookbehind using basename()
 *
 * @return
 *   filename
 */
$start = microtime(true);

for ($i=0; $i < 10000; $i++) {
    foreach($test as $val) {
        preg_match('#^(.*)(?<!\.htaccess|\.htpasswd|\.php|\.meta)$#i', basename($val), $matches);
        if (!empty($matches)) {
            //echo $matches[1], '<br>';
        }
    }
}

$end = microtime(true);
$time = $end - $start;

echo 'Test #2 - executed in: ', ($end - $start), ' seconds', '<br>';

/**
 * Test #3 - Negative lookahead using basename()
 *
 * Quickest regex, but lazy matching has it's downsides:
 * - using '\.htm' would exclude all .html files
 *
 * You can change this behaviour by adding negative lookaheads, but it's sloppy
 * and I wouldn't recommend it:
 * - to block .htm but allow .html files, '.*\.htm(?!l)'
 *
 * @return
 *   filename
 */
$start = microtime(true);

for ($i=0; $i < 10000; $i++) {
    foreach($test as $val) {
        preg_match('#^(?!\.htaccess|\.htpasswd|.*\.php|\.meta)(.*)$#i', basename($val), $matches);
        if (!empty($matches)) {
            //echo $matches[1], '<br>';
        }
    }
}

$end = microtime(true);
$time = $end - $start;

echo 'Test #3 - executed in: ', ($end - $start), ' seconds', '<br>';